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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520a8d85e38bc60f411240bfabf9058727808ee51b68f092ac69671cd835bd30' 
  AND token = 'bm4yGS4Xw4d6QA/NinvB3k70oYHUC0tY04xD+1Rfvw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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