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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a923f1aedb20d25c304c85a926f4fb6381ee8a793344ce29afef583748cc6038' 
  AND token = 'prh0ko3j46iyqoFMFes4/2SM4ZNQ02a0DdDx0jit2tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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