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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b93ae9f39d305efaf83e0da30506709c11ea8fe2f89d6eb48334851cc5ab53' 
  AND token = 'aY4zLMUwWjTuUta5t/Ju4HPpCgY+jvXX30yCueQIo10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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