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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c40bc006ccf3cadb969c589ce55c8b3e0e1c597668ff94e002e0bb98f841525' 
  AND token = 'mzvcxhM149jx6rwFUDcsUDP9OlREVPddqsN8hlNTGvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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