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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99114b7d59dc3535fcdd5bb6c2453f9c2fc1ef913e53f7590584802510bf3cc6' 
  AND token = '1goN0ybSRg0pQqYiAxDB4WTbVasld4c6mglosZp1dHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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