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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e397f1812f2653523ad69bf689ac787a34ff96580e3141f17ee783b568f66b' 
  AND token = 'aTLLVIkrE5uGVwyIbO8qDNpvJFopS8/kJMvFX0kHK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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