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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4715bc32e104857425bd22a823e86d84310f7de4ca0083eeef992dd8a1bb9f' 
  AND token = 'WWW1aDhwe6KRpIFtGX0Pk2b0vLbQK5PxTUK6q8XOuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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