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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128a40151ba98b85d5763c53dac9f77b6816b180139dc52f2a9abbea176a6631' 
  AND token = 'cZjgKhlcZgtIfnJ0xYjm7x5I4DLgd2xmUp2LQ/r6y5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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