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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cbbe24174e1b4edff025d7b416cc8074c4e000c689d8aec8b9308394fca5a2' 
  AND token = '7cyGxFIxvHT4hUkebo+mAabFFoEpJNDNH2HFrO9p5Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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