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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a98a23ebc44913ec0de10bede3e6c6dfad8a8a3f9a67361937eb3e8e6d698aa' 
  AND token = 'O9l6yCqk3Dly9DRNJ1PV0gvYJaHGmw+T/QV5FHG627w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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