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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087e0e5101ee726574ac46717b1dac2610dda95dc6a85d3ec81886e507925a24' 
  AND token = 'inZd6TLc2Qmh+ZCMFFHx672CZitvJHb4QutxaNEmrN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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