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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4d8cfe64ce004999b2a75263b6eee3dd18d6ad25399c06caa383054e5c52f2' 
  AND token = '8Tp3WFYxRPQXZ99m9mGo2+zBFXeZekiTHG7gF87VV8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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