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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2042c9f461969410e459d29af125207a40f67915ffd120ff9829a44879f110' 
  AND token = 'IUOJj9apjHJK5vl36xNLmU5JjHNOWEUOC9iuJHNr6bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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