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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9551a440e1809e63e15d7ae27e224d164c4d49cb250a4ca9851a0c34988b2d1' 
  AND token = 'W0zU6FSC9dO++z2tSno4xFuWI9Ib+VrQqUm2Gv5nzh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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