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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9557c01a830bbcaf2e10e1a71a1fc87d9b05c22a86a1ceed05683a413a0927d9' 
  AND token = '1BwDXoLFjYqcG5BuQ75zH9FVbUeutPnILqfmqlTTvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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