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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae23007ee6056ded8246425de474c4ca75ff9956a6ea6e2788e1fd6f7de17c58' 
  AND token = '5IY3lYgH7iC8YqNfDADRoyTVNjW0LdiX8EB4YLzqwWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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