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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30b604b729f5e0bb6ee5eebe15f75b8fdd829a080cfd69984c0e8dbd08916cc' 
  AND token = 'qa83N1r5linooZsFzqaBiCwh7r0Mjb1dcqBXoo5p8sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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