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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9f9bf2fbbd63fc265d557ad1e34889477ba8bd95959a0bd9d4dfd2720eb7e2' 
  AND token = 'ZJ6Fs2AGEtwSAxB9Maq4fW29AMB3FAcrfycKtaxsdWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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