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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510739078741321f13b0027451c434b165c3f470d8d2886b2b26476c546cd995' 
  AND token = 'coIBos3B8mAshroBuQOKkfGSnbkgFaf5/vikk0hR9mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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