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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03ea61b22b5fcb921a0da46eeb25c7c4a8a282a50768f32dc3761dd85f6f2f9' 
  AND token = 'sg6Ip5741dgt9KbsAxa7B5E4mfsKzLeO6TYawj5YJbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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