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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450f6f7c28328003e4a671cdaba496a02fcc64bbc68873856130937a29d02732' 
  AND token = '2MPDgSnNlpuvq2OuEvF41uwm6lTuxFD/JOCsISX1k2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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