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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e2b5f280da8348650bc2cdfa6ba37943396494c5f0263132dd61e6dad4a6b6' 
  AND token = 'fMHYlG8uP6dFKA6OZCR1917ZO8RW9Ky9kectpyPy8MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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