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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da9c1875fdb4d589b52f25f9ff83d4b9f39bbdc6bd274c56927c2b45b9e6f3c' 
  AND token = 'fHe//IipLZHb+XxGItxVs5ufgjH31hxgUTUEcT2Q7QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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