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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d75a06924a0e509713229af8977a2fd56f090cc1f52b388773375edc56054bb' 
  AND token = 'ddrx7KXV0RoBUUvM1mTVJMMhf7ITFtHstp9t7G6W1po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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