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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d511058e90ee2479824c6b267f23989f7a0c057fc1c5ec5a4fc2858435b5fa' 
  AND token = 'IyIlgb9xXx4p/lsWbH+rU7wjck3rivG332BfHpgzXQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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