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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31647f91607175a94bc229ec82c7bb8d1cca0e3475ca325e59a17706706c79e' 
  AND token = 'yfx8jn6bayO9efcA74bodW9VuZUscslqFL+7eit4Lp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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