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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe5eba6948743f3b3501d6064a945bcda3b8ff4bb4840f6124868c67fd65d5d' 
  AND token = 'Ab47AQqsDsffp9jCJLlWO7z19QT0qSsD6dHF1sSpcHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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