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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3c15d95059e4657239f5df27fc22d1436f941282b0d41ceac675f533cf4200' 
  AND token = '+sjb4VG8od6B7Wri6L/09mX6EmVTmlSLxqGFmj2biZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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