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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb1b0d8152147918cdcd69d75c3653b75727edaf30b713da9bee1117f304132' 
  AND token = 'Qmaa0j4jOL/bq/rXt8k5hgHPb1bELqIs77AG5h7DEPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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