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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff4902d64431b9b85f161f2372a8083b2d3824ae37bc10a7efd20cbd4838e98' 
  AND token = '08aGvnt+8Cswqung4yTlx2PIedHcZGF0l5s73GwCadI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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