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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeb1326c0fb3a5a2bc940cb1618b7fd2f40416091c1e1cdc6357ead3bda447d' 
  AND token = 'V/BNHMJfHEh3YOal4dJtrkLdjWZ4toRxNoquQkfGHN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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