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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89a1e059035610417b37a9ef7eac0dbdf7e7dd3e30b51986b0a48284b83ab9e' 
  AND token = '0cND03FIy48EtJYzLDMPCg3rzQqY60OQ9Rc7wsO5AAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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