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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a30f5ca4c3a6a2929632f5bbad904eaf12d4f47f179020afa8b655d48e44cd' 
  AND token = 'wSh8n0PjOacIj3aRQxA9OvdDVR/5kdP+5W387Ol8l/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}