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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6010f3fcc7f21bf8379018adfc6b422c369585d6aa0d64546b3916f0d4af6d5b' 
  AND token = 'SRRSSohipRdKzQ0Hq35HCFDKFeI1UOY0OLOebXkH6q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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