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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0265df837fd9cf3ee7290affd99e7feeb4e7b352d8c19f3561dae7a98bc6654d' 
  AND token = 'Q7TxZ9GiTmdmAVOgtfQJxOSTjNIEnTKi/m9P+X1ml9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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