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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0516d4798db2e39e783c0720ecf9d08ff4e59229358884852e0b7258e3fe30' 
  AND token = 'nUK62DF2n+cgkQ01Vm4CAIytKhwec27NXWk2tQG0lK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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