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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdad7756d474b27ddd111d36664d82dda6d63a1789092edf925072cdf1f3542d' 
  AND token = 'Z9hUQdXqpEzMUnPE3XAL/FYXZG59tYjnaJdWD3KTdkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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