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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ab9fa2f3b9c9c85a2c1a865a38fbc5aa019aa8472ea7af707e176b363dda63' 
  AND token = 'Mz1w7Qg1Gk1TvZGKN65IhdFvJOOm0K1PEFrZfQxjPJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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