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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e17dd968787b149406b7d3ffdfb63c0cb184ecb12c29104e8baf5f9383b8db0' 
  AND token = 'NXBjqH1+mF/fOeafP+RIrKTdlpG4R/xrE9I973LwKXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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