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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb43b71280c001b0cfc19edefa7f24e29ff8ff7b525e83fa535992070a35caf' 
  AND token = 'ChBlZTI17wTaamE9d/qW6q5/Om4kp59Gof64RUDZoqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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