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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4669465621097ea80910f84c119b26fb7a1de9c573a2a458c8b290eb3c37ff0f' 
  AND token = 'NNePTb0C8zPxkJ5Re6Z0budp1ozPxclwZEAi5op+4lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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