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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc83cf634289d75402042941355129ad6a584e001ce687da1373260b73e1f5f' 
  AND token = '01UstDa/t+hqjG+WdGGffPkCE4Ipr6dS817lo7lxtQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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