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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1953a448074669f21998ce87651bf2748f897f0b13bec94390298258726a00' 
  AND token = '/cCjb7/EMuhcxNAiU38yV/VmYT5f9uNtnUTtRJlq0JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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