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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c159e4e1ab06de11b5689c6d2d436c298b189f3e176444c60456d99805486975' 
  AND token = 'kcQ9OBIfmpvJZ+rT4DrCN5pgcvkHWV/le89+zD4V/oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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