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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1831e005d73d9911db12b3041122117ea12aa751604a38c358abfceea0171570' 
  AND token = 'kIUn91K+BRfGdw/j031rUlad+Lc8DAjlD9Xu2V3qSgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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