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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b73a063ea5e8a0f1a56eebf6f4ccf3dd69ca7dbcf45a84252c325df1334388a' 
  AND token = 'uB58go42tN5JkSb3K/4cqD/GvpYHFaezV8gE0uq0toY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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