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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507396f978d2462d06f67921b1ec280a0f84901de0e483de68be370cf0bea84e' 
  AND token = 'kXHMNC8tcabBwodLoA52lKkiDyssNzFVt47CJ74kvSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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