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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6c10fece2c8a3815f3a2ef80b45762fd1677df624c1802b09705602c39bb47' 
  AND token = 'xmAxbVyRnUSPj24L7O0+ItyjbXVsuaxQ7nz8Lt16dhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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