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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1365360a23e6f88af5b5be2deb901046af6e5be9cdeb69809bcf95b27412101' 
  AND token = '3hkyAxyu6zSEUywHauxTwxK6HuLuyUbqqoXp5dfbdXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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