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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13ce02bfbbad1f588bce9555afce4da0ab4681c3d9406836648a6d1a4e62718' 
  AND token = 'HFQxniJinuXIl/rf7b6FsLUx/rtdHNy5Rqil5DorYcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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