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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8127e5b16e606d3471d54697807853d8ea9c6da8421116e1d0f6a64309dcd5' 
  AND token = 'AuLVxJr1V89BcLaSyf75as+VMOZQmzPrNDH4ZoB1L40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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