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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b495df5b277f46e735b942483fa6fe10e71d389c95042576afa5ba10187b0dd' 
  AND token = '8DNZdxsVUCXnei9Szz2NbIBd/566SjP7p4BvbXM8sO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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