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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f6e20ee73e9aa95f657aabba17fd58cb158c4d1e4cd460ec88b4ee71c4aa40' 
  AND token = 'YTLbGEyz7l8dsHjZAXmoyMayChCIV3W424mThtq/tpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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