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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b83b4d2eaaa70c277f9591d8b06691064cca10a9b3d6bdbc2df75fae2ba49f' 
  AND token = '5WNcsKhpAYs5WVVsnJOkdtiAJeS4lKClPIi4TGiGO4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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