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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873463c9639cbf80cac8e6070448c2239e9da54c1967f7d43bd7a2b659ad3a97' 
  AND token = 'QOyZ7TCyRjmb8o0fckTlRv43cMozfpEreOXe/D6sO7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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