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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2795a344c5d47f39433f830cf03dc31da405f12ca3ea988ec088c99799c77fb2' 
  AND token = 'oZeSVttEt6zusfsy1SB95LWfP53NRmRl1RtqIwqyQxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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