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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79515aa61df6b599fd87c06396398832ec923931132d4609bc5324ad38aa6da6' 
  AND token = 'NnqVY6NxCyGJP+1STXDz7mVjtUEqYEhNErbbLttbtMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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