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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835d6ad5a4ae16ef896c420bd3bfa1f97f5a7889962942538966430596bda82d' 
  AND token = 'Y0Zo3Vi+gFmrSzLUEje9yEx08Kdi8tknd0Z183mYArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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