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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add1728dfde2f4ca020b963c332093de9612f38590f13b440819284a4c1730b5' 
  AND token = 'PmMH3Rsj6criO8/KKW3h36orlnNwRLCbwzINeY/7rIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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