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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff43f328e0a36a1a2d1398b6e736ec23dfc5a4d4803d8d3c417fe562a98645e' 
  AND token = 'lwFRw4DETTtEzPCwSRDSmro6haMj54GmBb2piwbTgWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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